[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   15.299460] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   20.071178] random: sshd: uninitialized urandom read (32 bytes read)
[   20.363130] random: sshd: uninitialized urandom read (32 bytes read)
[   21.039409] random: sshd: uninitialized urandom read (32 bytes read)
[   21.177457] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts.
[   26.598542] random: sshd: uninitialized urandom read (32 bytes read)
[   26.685294] IPVS: ftp: loaded support on port[0] = 21
[   39.281449] ------------[ cut here ]------------
[   39.286259] do_IRQ(): syz-executor694 has overflown the kernel stack (cur:ffff8801d6bf0000,sp:ffff8801cde237e0,irq stk top-bottom:ffff8801dae00080-ffff8801dae08000,exception stk top-bottom:fffffe0000007080-fffffe0000011000,ip:lock_acquire+0x278/0x540)
[   39.308650] WARNING: CPU: 0 PID: 10742 at arch/x86/kernel/irq_64.c:63 handle_irq+0x1fb/0x2e7
[   39.317204] Kernel panic - not syncing: panic_on_warn set ...
[   39.317204] 
[   39.324552] CPU: 0 PID: 10742 Comm: syz-executor694 Not tainted 4.18.0-rc3-next-20180706+ #1
[   39.333105] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.342437] Call Trace:
[   39.345003]  <IRQ>
[   39.347148]  dump_stack+0x1c9/0x2b4
[   39.350765]  ? dump_stack_print_info.cold.2+0x52/0x52
[   39.355951]  panic+0x238/0x4e7
[   39.359142]  ? add_taint.cold.5+0x16/0x16
[   39.363275]  ? __warn.cold.8+0x148/0x1ba
[   39.367314]  ? __warn.cold.8+0x117/0x1ba
[   39.371355]  ? handle_irq+0x1fb/0x2e7
[   39.375135]  __warn.cold.8+0x163/0x1ba
[   39.379001]  ? handle_irq+0x1fb/0x2e7
[   39.382790]  report_bug+0x252/0x2d0
[   39.386396]  do_error_trap+0x1fc/0x4d0
[   39.390272]  ? rcu_idle_enter+0x480/0x480
[   39.394399]  ? math_error+0x3e0/0x3e0
[   39.398190]  ? vprintk_default+0x28/0x30
[   39.402242]  ? vprintk_func+0x81/0xe7
[   39.406027]  ? printk+0xa7/0xcf
[   39.409300]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   39.414124]  do_invalid_op+0x1b/0x20
[   39.417821]  invalid_op+0x14/0x20
[   39.421252] RIP: 0010:handle_irq+0x1fb/0x2e7
[   39.425640] Code: 00 00 ff b6 80 00 00 00 48 c7 c7 40 bc e4 87 41 54 41 55 65 48 8b 04 25 40 ee 01 00 48 05 68 06 00 00 48 89 c6 e8 25 c0 1c 00 <0f> 0b 48 83 c4 18 e9 3f ff ff ff 48 89 75 e0 e8 11 64 90 00 48 8b 
[   39.444760] RSP: 0018:ffff8801dae07f58 EFLAGS: 00010082
[   39.450104] RAX: 0000000000000000 RBX: ffff8801ce183b40 RCX: 0000000000000000
[   39.457350] RDX: 0000000000010000 RSI: ffffffff81634381 RDI: 0000000000000001
[   39.464600] RBP: ffff8801dae07fb0 R08: ffff8801c881a640 R09: ffffed003b5c3ec2
[   39.471857] R10: ffffed003b5c3ec2 R11: ffff8801dae1f617 R12: fffffe0000011000
[   39.479104] R13: fffffe0000007080 R14: 000000000000002a R15: 0000000000000000
[   39.486366]  ? vprintk_func+0x81/0xe7
[   39.490154]  ? handle_irq+0x1fb/0x2e7
[   39.493958]  ? lock_acquire+0x278/0x540
[   39.497912]  ? rcu_irq_enter+0xd8/0x110
[   39.501867]  do_IRQ+0x78/0x190
[   39.505052]  common_interrupt+0xf/0xf
[   39.508825]  </IRQ>
[   39.511494] Dumping ftrace buffer:
[   39.515015]    (ftrace buffer empty)
[   39.518698] Kernel Offset: disabled
[   39.522300] Rebooting in 86400 seconds..